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Painful start

点击量:   时间:2019-03-06 11:02:04

OPERATING on fetuses and newborns might make them more sensitive to pain later in life, say researchers at the National Institutes of Health near Washington DC. MaryAnn Ruda and colleagues simulated surgery on newborn rats by injecting an inflammatory agent into a hind paw. When the rats reached adulthood, they withdrew the test paw from a hot bulb much faster than rats that had been injected with saline as newborns (Science, vol 289, p 628). They also had more nerves in the region. Until the 1980s,